Spaces which admit negative powers and all roots (Preliminary communication)

Věra Trnková

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Jiří Adámek, Miroslav Katětov (1994)

Mathematica Bohemica

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Ternary semigroups of morphisms of objects in categories

Antoni Chronowski, Miroslav Novotný (1995)

Archivum Mathematicum

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In this paper the notion of a ternary semigroup of morphisms of objects in a category is introduced. The connection between an isomorphism of categories and an isomorphism of ternary semigroups of morphisms of suitable objects in these categories is considered. Finally, the results obtained for general categories are applied to the categories $𝐑𝐄𝐋 n + 1$ and $𝐀𝐋𝐆 n$ which were studied in [5].

On full embeddings of categories of algebras into categories of functors with thin domain (Preliminary communication)

Věra Trnková, Jan Reiterman (1971)

Commentationes Mathematicae Universitatis Carolinae

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